<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
    div {
        width: 100px;
        height: 100px;
        background-color: pink;
    }
    </style>
</head>
<body>
    <div></div>
    <script>
    // 高阶函数 - 函数可以作为参数传递
    function fn(a, b, callback) {
        console.log(a + b);
        callback && callback();
    };
    fn(1, 2, function() {
        console.log('我是最后调用的');
    });

    // 需要引入 Jquery 
    $('div').animate({ left: 500 }, function() {
        $('div').css('backgroundColor', 'purple');
    })
    </script>
</body>
</html>